// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================

package org.eclipse.jetty.util.ajax;

import java.text.DateFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;

import org.eclipse.jetty.util.DateCache;
import org.eclipse.jetty.util.ajax.JSON.Output;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;

/* ------------------------------------------------------------ */
/**
 * Convert a {@link Date} to JSON. If fromJSON is true in the constructor, the JSON generated will be of the form {class="java.util.Date",value="1/1/1970 12:00 GMT"} If fromJSON is false, then only the string value of the date is generated.
 */
@SuppressWarnings({ "rawtypes" })
public class JSONDateConvertor implements JSON.Convertor
{

	private static final Logger LOG = Log.getLogger(JSONDateConvertor.class);
	private boolean _fromJSON;
	DateCache _dateCache;
	SimpleDateFormat _format;

	public JSONDateConvertor()
	{
		this(false);
	}

	public JSONDateConvertor(boolean fromJSON)
	{
		this(DateCache.DEFAULT_FORMAT, TimeZone.getTimeZone("GMT"), fromJSON);
	}

	public JSONDateConvertor(String format, TimeZone zone, boolean fromJSON)
	{
		_dateCache = new DateCache(format);
		_dateCache.setTimeZone(zone);
		_fromJSON = fromJSON;
		_format = new SimpleDateFormat(format);
		_format.setTimeZone(zone);
	}

	public JSONDateConvertor(String format, TimeZone zone, boolean fromJSON, Locale locale)
	{
		_dateCache = new DateCache(format, locale);
		_dateCache.setTimeZone(zone);
		_fromJSON = fromJSON;
		_format = new SimpleDateFormat(format, new DateFormatSymbols(locale));
		_format.setTimeZone(zone);
	}

	public Object fromJSON(Map map)
	{
		if (!_fromJSON)
			throw new UnsupportedOperationException();
		try
		{
			synchronized (_format)
			{
				return _format.parseObject((String)map.get("value"));
			}
		} catch (Exception e)
		{
			LOG.warn(e);
		}
		return null;
	}

	public void toJSON(Object obj, Output out)
	{
		String date = _dateCache.format((Date)obj);
		if (_fromJSON)
		{
			out.addClass(obj.getClass());
			out.add("value", date);
		}
		else
		{
			out.add(date);
		}
	}
}
